Lien, Tran Van, Ngo Trong Duc, and Nguyen Tien Khiem. “Mode Shape Analysis of Multiple Cracked Functionally Graded Beam-Like Structures by Using Dynamic Stiffness Method”. Vietnam Journal of Mechanics 39, no. 3 (September 23, 2017): 215–228. Accessed April 23, 2024. https://vjs.ac.vn/index.php/vjmech/article/view/8631.